1 If you like to play baseball, or dance, or swim, or just keep active, you will want to keep your respiratory system in top shape. Being able to breathe in lots of oxygen makes it easier to do any activity, and what you need in order to breathe in big breaths of oxygen is a strong and healthy respiratory system.2 The two things that are really good for your lungs and the rest of your respiratory system are exercise and not putting anything into your lungs that is bad for them.3 Aerobic exercises make your lungs strong and make you breathe in more oxygen. In fact the word aerobic has to do with your muscles using oxygen. Of course, you don't have to set a timer and do 1/2 hour of jumping jacks or other aerobic exercises every day. Any activities that get you moving are good. Just getting outside is a good start. People seem to think of more active things to do once they are out in the sunshine, and away from the TV.